<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js canvas - interactive - voxel painter</title>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
		<style>
			body {
				font-family: Monospace;
				background-color: #f0f0f0;
				margin: 0px;
				overflow: hidden;
			}
		</style>
	</head>
	<body>

		<script src="../build/three.js"></script>

		<script src="js/renderers/Projector.js"></script>
		<script src="js/renderers/CanvasRenderer.js"></script>

		<script>

			var container;
			var camera, scene, renderer;
			var plane;

			var mouse, raycaster, isShiftDown = false;

			var cubeGeometry = new THREE.BoxGeometry( 50, 50, 50 );
			var cubeMaterial = new THREE.MeshLambertMaterial( { color: 0x00ff80, overdraw: 0.5 } );

			var objects = [];

			init();
			render();

			function init() {

				container = document.createElement( 'div' );
				document.body.appendChild( container );

				var info = document.createElement( 'div' );
				info.style.position = 'absolute';
				info.style.top = '10px';
				info.style.width = '100%';
				info.style.textAlign = 'center';
				info.innerHTML = '<a href="http://threejs.org" target="_blank">three.js</a> - voxel painter<br><strong>click</strong>: add voxel, <strong>shift + click</strong>: remove voxel, <a href="javascript:save()">save .png</a>';
				container.appendChild( info );

				camera = new THREE.PerspectiveCamera( 40, window.innerWidth / window.innerHeight, 1, 10000 );
				camera.position.set( 500, 800, 1300 );
				camera.lookAt( new THREE.Vector3() );

				scene = new THREE.Scene();

				// Grid

				var size = 500, step = 50;

				var geometry = new THREE.Geometry();

				for ( var i = - size; i <= size; i += step ) {

					geometry.vertices.push( new THREE.Vector3( - size, 0, i ) );
					geometry.vertices.push( new THREE.Vector3(   size, 0, i ) );

					geometry.vertices.push( new THREE.Vector3( i, 0, - size ) );
					geometry.vertices.push( new THREE.Vector3( i, 0,   size ) );

				}

				var material = new THREE.LineBasicMaterial( { color: 0x000000, opacity: 0.2 } );

				var line = new THREE.LineSegments( geometry, material );
				scene.add( line );

				//

				raycaster = new THREE.Raycaster();
				mouse = new THREE.Vector2();

				var geometry = new THREE.PlaneBufferGeometry( 1000, 1000 );
				geometry.rotateX( - Math.PI / 2 );

				plane = new THREE.Mesh( geometry, new THREE.MeshBasicMaterial( { visible: false } ) );
				scene.add( plane );

				objects.push( plane );

				var material = new THREE.MeshBasicMaterial( { color: 0xff0000, wireframe: true } );

				// Lights

				var ambientLight = new THREE.AmbientLight( 0x606060 );
				scene.add( ambientLight );

				var directionalLight = new THREE.DirectionalLight( 0xffffff );
				directionalLight.position.x = Math.random() - 0.5;
				directionalLight.position.y = Math.random() - 0.5;
				directionalLight.position.z = Math.random() - 0.5;
				directionalLight.position.normalize();
				scene.add( directionalLight );

				var directionalLight = new THREE.DirectionalLight( 0x808080 );
				directionalLight.position.x = Math.random() - 0.5;
				directionalLight.position.y = Math.random() - 0.5;
				directionalLight.position.z = Math.random() - 0.5;
				directionalLight.position.normalize();
				scene.add( directionalLight );

				renderer = new THREE.CanvasRenderer();
				renderer.setClearColor( 0xf0f0f0 );
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				container.appendChild(renderer.domElement);

				document.addEventListener( 'mousedown', onDocumentMouseDown, false );
				document.addEventListener( 'keydown', onDocumentKeyDown, false );
				document.addEventListener( 'keyup', onDocumentKeyUp, false );

				//

				window.addEventListener( 'resize', onWindowResize, false );

			}

			function onWindowResize() {

				camera.aspect = window.innerWidth / window.innerHeight;
				camera.updateProjectionMatrix();

				renderer.setSize( window.innerWidth, window.innerHeight );

				render();

			}

			function onDocumentMouseDown( event ) {

				event.preventDefault();

				mouse.x = ( event.clientX / renderer.domElement.clientWidth ) * 2 - 1;
				mouse.y = - ( event.clientY / renderer.domElement.clientHeight ) * 2 + 1;

				raycaster.setFromCamera( mouse, camera );

				var intersects = raycaster.intersectObjects( objects );

				if ( intersects.length > 0 ) {

					var intersect = intersects[ 0 ];

					if ( isShiftDown ) {

						if ( intersect.object != plane ) {

							scene.remove( intersect.object );

							objects.splice( objects.indexOf( intersect.object ), 1 );

						}

					} else {

						var voxel = new THREE.Mesh( cubeGeometry, cubeMaterial );
						voxel.position.copy( intersect.point ).add( intersect.face.normal );
						voxel.position.divideScalar( 50 ).floor().multiplyScalar( 50 ).addScalar( 25 );
						scene.add( voxel );

						objects.push( voxel );

					}

					render();

				}

			}

			function onDocumentKeyDown( event ) {

				switch( event.keyCode ) {

					case 16: isShiftDown = true; break;

				}

			}

			function onDocumentKeyUp( event ) {

				switch( event.keyCode ) {

					case 16: isShiftDown = false; break;

				}
			}

			function save() {

				window.open( renderer.domElement.toDataURL('image/png'), 'mywindow' );
				return false;

			}

			function render() {

				renderer.render( scene, camera );

			}

		</script>

	</body>
</html>
